This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
you open log4j.jar using winrar and check whether the mentioned class file is there or not. >> org.apache.log4j.spi.ThrowableInformation.class
PS: put the error inside code tag, makes it easier to read.